1
Donald O Hitzman: Oxygen scavenging with enzymes. Phillips Petroleum Company, November 8, 1983: US04414334 (80 worldwide citation)

Removal of ambient oxygen from aqueous liquids is effectively catalyzed by enzymatic deoxygenation systems comprising alcohol oxidase in the presence of alcohol optionally with catalase. Suitable deoxygenation systems described can be used to alleviate corrosion and oxidative degradation in areas su ...


2
Donald O Hitzman: Enhanced oil recovery process using microorganisms. Phillips Petroleum Company, May 29, 1984: US04450908 (43 worldwide citation)

Residual polymeric material from a post-secondary oil recovery operation is consumed by microorganisms injected into the oil-bearing reservoir. The resulting metabolic products, including surfactant-acting substances, enhance additional oil production from the reservoir.


3
Donald O Hitzman: Enhanced oil recovery using microorganisms. Phillips Petroleum Company, May 8, 1984: US04446919 (34 worldwide citation)

A post-primary oil recovery process is provided in which carbon dioxide-tolerating microorganisms are injected into an oil-bearing subterranean formation and feed on nutrients which are extracted from the oil by carbon dioxide injected and maintained under a pressure of at least about 500 psig. The ...


4
Francis J Shell, Donald O Hitzman: Enzymatic decomposition of drilling mud. Phillips Petroleum Company, Laney Dougherty Hessin & Beavers, November 24, 1992: US05165477 (29 worldwide citation)

Drilling mud is rapidly decomposed by admixing one or more enzymes with the mud to selectively degrade one or more polymeric organic viscosifiers therein. A method of cleaning up a well site drilling mud pit containing drilling mud is provided. Also provided are a composition and method of removing ...


5
Donald O Hitzman, George T Sperl, Kenneth A Sandbeck: Method for reducing the amount of and preventing the formation of hydrogen sulfide in an aqueous system. Geo Microbial Technologies, Foley & Lardner, April 11, 1995: US05405531 (24 worldwide citation)

Hydrogen sulfide present in an aqueous system is removed and the production of hydrogen sulfide by sulfate-reducing bacteria (SRB) is eliminated by introducing into the system nitrite and nitrate and/or molybdate ions, whereby denitrifying microorganisms outcompete the sulfate-reducing bacteria for ...


6
Donald O Hitzman: Production of methane by anaerobic fermentation of waste materials. Phillips Petroleum Company, Williams Phillips & Umphlett, January 17, 1989: US04798801 (20 worldwide citation)

A method of producing methane from the anaerobic fermentation of waste materials, such as municipal solid waste, in a series of cavities in the earth holding such solid waste material and covered with earth excavated from the next adjacent cavity. Various forms of apparatus for withdrawing the produ ...


7
Donald O Hitzman, Eugene H Wegner: Methanol foam fermentation to single cell protein by microorganisms. Phillips Petroleum Company, September 28, 1976: US03982998 (19 worldwide citation)

A process for the production of microbial cells by fermenting a carbonaceous material in a foam fermenter containing an oxygen-enriched nutrient medium. The process uses a source of carbon which is assimilable by the microorganism for the production of the microbial cells. The microbial cells are se ...


8
Donald O Hitzman: Integrated fermentation-photosynthesis biomass process. Phillips Petroleum Company, Neuman Williams Anderson & Olson, August 30, 1977: US04044500 (18 worldwide citation)

An integrated process in which aerobic fermentation and photosynthesis are combined. In a first step, fermentation is conducted to produce cells which are recovered. The effluent from the fermentation is used for cultivation of algae with the carbon dioxide produced in the fermentation step being ci ...


9
Francis J Shell, Donald O Hitzman: Enzymatic decomposition of drilling mud. Phillips Petroleum Company, Laney Dougherty Hessin & Beavers, June 30, 1992: US05126051 (14 worldwide citation)

Drilling mud is rapidly decomposed by admixing one or more enzymes with the mud to selectively degrade one or more polymeric organic viscosifiers therein. A method of cleaning up a well site drilling mud pit containing drilling mud is provided. Also provided are a composition and method of removing ...


10
Donald O Hitzman: Enriched oil recovery using carbon dioxide. Provesta Corporation, April 14, 1981: US04261420 (13 worldwide citation)

A single cell protein plant is operated to produce high density cell growth and a substantially pure stream of generally high pressure carbon dioxide for further use, for example, in enhanced oil recovery operations. The plant employs an air separator producing substantially pure streams of oxygen a ...